[clang] [llvm] [Clang] [OpenMP] Support NOWAIT with optional argument (PR #128742)

[Michael Klemm via llvm-commits]

================
@@ -6,13 +6,11 @@ void foo() {
 }
 
 int main(int argc, char **argv) {
-#pragma omp target teams nowait( // expected-warning {{extra tokens at the end of '#pragma omp target teams' are ignored}}
-  foo();
-#pragma omp target teams nowait (argc)) // expected-warning {{extra tokens at the end of '#pragma omp target teams' are ignored}}
+#pragma omp target teams nowait( // expected-error {{expected expression}} // expected-error {{expected ')'}} //expected-note {{to match this '('}}
   foo();
 #pragma omp target teams nowait device (-10u)
   foo();
-#pragma omp target teams nowait (3.14) device (-10u) // expected-warning {{extra tokens at the end of '#pragma omp target teams' are ignored}}
+#pragma omp target teams nowait (3.14) device (-10u) // expected-error {{arguments of OpenMP clause 'nowait' with bitwise operators cannot be of floating type}}
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mjklemm wrote:

```suggestion
#pragma omp target teams nowait (3.14) device (-10u) // expected-error {{arguments of OpenMP clause 'nowait' with bitwise operators cannot be of floating-point type}}
```

https://github.com/llvm/llvm-project/pull/128742